
	package temp;  
	  
	import java.io.UnsupportedEncodingException;  
	import java.security.MessageDigest;  
	import java.security.NoSuchAlgorithmException;  
	  
	/** 
	 * 采用MD5加密解密 
	 * @author tfq 
	 * @datetime 2011-10-13 
	 */  
	public class MD5 {  
	  
	    /*** 
	     * MD5加码 生成32位md5码 
	     */  
	    public String string2MD5(String inStr){  
	        MessageDigest md5 = null;  
	        try{  
	            md5 = MessageDigest.getInstance("MD5");  
	        }catch (Exception e){  
	            System.out.println(e.toString());  
	            e.printStackTrace();  
	            return "";  
	        }  
	        char[] charArray = inStr.toCharArray();  
	        byte[] byteArray = new byte[charArray.length];  
	  
	        for (int i = 0; i < charArray.length; i++)  
	            byteArray[i] = (byte) charArray[i];  
	        byte[] md5Bytes = md5.digest(byteArray);  
	        StringBuffer hexValue = new StringBuffer();  
	        for (int i = 0; i < md5Bytes.length; i++){  
	            int val = ((int) md5Bytes[i]) & 0xff;  
	            if (val < 16)  
	                hexValue.append("0");  
	            hexValue.append(Integer.toHexString(val));  
	        }  
	        return hexValue.toString();  
	  
	    }  
	  
	    /** 
	     * 加密解密算法 执行一次加密，两次解密 
	     */   
	    public static String convertMD5(String inStr){  
	  
	        char[] a = inStr.toCharArray();  
	        for (int i = 0; i < a.length; i++){  
	            a[i] = (char) (a[i] ^ 't');  
	        }  
	        String s = new String(a);  
	        return s;  
	  
	    }  
	  
	    // 测试主函数  
	    public static void main(String args[]) {  
	        String s = new String("123456");  
	        System.out.println("原始：" + s);  
	        System.out.println("MD5后：" + string2MD5(s));  
	     
	         
	  
	    }  
	}  

